﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.IdentityModel.Tokens;
using Microsoft.Extensions.Options;
using StageTodo.Web.Authorization;
using System.Text;
using StageToDo.Entity.Data;
using StageToDo.Service.Service;

namespace StageTodo.Web
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

            if (env.IsDevelopment())
            {
                // For more details on using the user secret store see https://go.microsoft.com/fwlink/?LinkID=532709
                builder.AddUserSecrets<Startup>();
            }

            builder.AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddCors();
            services.AddSingleton<UserService>();
            services.AddMvc();

            // Add application services.

        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();

            var signingKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration.GetSection("TokenAuthentication:SecretKey").Value));
            var issuer = Configuration.GetSection("TokenAuthentication:Issuer").Value;
            var audience = Configuration.GetSection("TokenAuthentication:Audience").Value;
            var path = Configuration.GetSection("TokenAuthentication:TokenPath").Value;
            var tokenProviderOptions = new TokenProviderOptions
            {
                Path = path,
                Audience = audience,
                Issuer = issuer,
                SigningCredentials = new SigningCredentials(signingKey, SecurityAlgorithms.HmacSha256)
            };

            //该中间件生成token
            app.UseMiddleware<Authorization.Middlewares.AuthMiddleware>(Options.Create(tokenProviderOptions));

            var tokenValidationParameters = new TokenValidationParameters
            {
                // The signing key must match!
                ValidateIssuerSigningKey = true,
                IssuerSigningKey = signingKey,

                // Validate the JWT Issuer (iss) claim
                ValidateIssuer = true,
                ValidIssuer = issuer,

                // Validate the JWT Audience (aud) claim
                ValidateAudience = true,
                ValidAudience = audience,

                // Validate the token expiry
                ValidateLifetime = true,

                // If you want to allow a certain amount of clock drift, set that here:
                // ClockSkew = TimeSpan.Zero
            };

            //token校验
            app.UseJwtBearerAuthentication(new JwtBearerOptions
            {
                AutomaticAuthenticate = true,
                AutomaticChallenge = true,
                TokenValidationParameters = tokenValidationParameters
            });

            app.UseCors(builder => builder.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader().AllowCredentials());


            // Add external authentication middleware below. To configure them please see https://go.microsoft.com/fwlink/?LinkID=532715

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}
